Brown, 43, reportedly broke down backstage before the show and was too distraught to perform in his band's opening song. According to Us Weekly, Brown joined the group for their second song, "Hit Me Off."

During an intermission, Houston's 1985 song "You Give Good Love" was played over the speakers, prompting scores of fans to stand up and sing along, OnTheRedCarpet.com has learned.

Houston married Brown in 1992 and filed a domestic abuse charge against him the following year. The pair got divorced in 2007. Houston had sole custody of the couple's only daughter, 18-year-old Bobbi Kristina Brown.

Though they had a famously tumultuous relationship, Houston told Oprah Winfrey in 2009 that she had done drugs with Brown but told the talk show host, "I loved him so much...He was my drug. I didn't do anything without him."

Houston was believed to have dated R&B artist Ray J on and off since 2007. Ray J is the brother of singer Brandy and famously starred in a sex tape with reality actress Kim Kardashian that was leaked that year as well and filmed years earlier. He and Houston have spent time together in recent days and on February 3, they were photographed leaving a Los Angeles restaurant and getting into a car. He has not commented on her death.